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FATIGUE STRENGTH OF MULTI-SPOT WELDED JOINTS

This investigation is carried out in order to establish an estimation procedure of fatigue strength under tensile shear load of multi-spot welded joints arranged in perpendicular to the load direction, by using maximum load vs. number of repeated cycles curve of single-spot welded joint which has the same nugget diameter with those of multi-spot welded joints. From this purpose, a hypothesis which is able to connect fatigue strength of multi-spot welded joints and that of equivalent single-spot welded specimen is set up and its experimental verification is carried out using spot welded specimens in mild steel, high strength steel and commercially pure aluminum. It becomes sure that the hypothesis holds good, using results of strain measurement in the neighborhood of each spot weld. (Author)